Shock absorber



Feb. 28, 1928.

I 1,660,457 D. H. SWEET SHOCK ABSORBER Filed Sept. 26. 1921 w 26 www* lso Patented Feb. 2s, 192s.

DONALD'H. SWEET, 0F CHICAGO, ILLINOIS;

sHocK .Ansmann-.Y` e

Application vledcpteniber 26,.1921. Serial` No. 503,176.

The object of my invention is to` improve.

means for decreasing the jars and movements to which the body of a vehicle is subjected in traveling.. over anuneven surface.

In the accompanying drawings:

1 isa side viewof apparatus according to my invention; Y

Fig. 2 is a view of the vother side on a larger scale; andV Fig. 3 is a section on line 3&3 of 2 on"v and containing a filling 0f friction material' 26. A boss v28-projectsv from-head .24 into the depression to kcpthe parte centered and seal the depression,

A sleeve '.30 slidesvv loosely on arm 12 vand is connected to -a lugfg32 on; head 22 by alink 34. The pintle 36 connectingdug32 and link 34 may beO taperedif desiredV andl provided with anadjusting.n ut38.` A U1shapedzclip 40 voverlies sleevet 30 andmay be vpressed against. the-same by meansofnuts42 on studs 44. Betweenthe clipandthe sleeve lies a,.slide.46 in frictional engagement with both sleeve vandfclip, beinglotted at 48to accommodate studs 44. Friction linings 49 may. belprovidednt: pOIlS-v Slide 46 terminates in a perforate head encircling pintle 18, the perforation being enlarged to permit limited movement of the slide. Wedge surfaces 50 cooperate with similar faces in a slotted cap 52 interposed between them and the head of pintle 18. The other lend of the pintle carries ordinary lock nuts 54, preferably bearing on a washer 56 of brass or antifriction metal. A flatstiff leaf spring 58 with four arms may be interposed between washers 56 and the adjacent head.

Any displacement of the parts from the position shown in Fig. 1 will move the sleeve toward the pintle 18 and the parts are preferably so adjusted that during this. move- :ment the resistance of the device is relatively lsmall or practically negligible. The4 be:y vginmng of the return-movement, however,

will draw slide 46 with sleeve 8O and ,cap v` 52 will b e .forced'away from the heady ,24,

drawing theheads forcibly together andlocr casioning v relatively great frictional resistance to the return movement.

Without further elaboration'the foregoing willso fullyy explainmthe gist ofmy inyention lthat others may, by applyingcurrent knowledge, readily adapt theesaine4 for use under various conditions of service, withont eliminating certain Afeatures which may propf erly be said to constitute the essential items ofnoveltyinvolved, which items are inten,d-l

ed to bedefined and secured. to mve'b-y thefollowing claims. l Y

1. In combination, twopivotedelements, a member slidable oni one element andv linked yto/,thebther for movement towardv the pivf otal connection upon relative, displacement of said elements ineitherdirection. from, al predetermined position, ymeans adjacent the pivotal connection forvarying thel frictional resistance to movement betweensaid elements, and anoperative connectionbef tween said member andsai-dfrictionvarying means. t

2, In combination, pivotedelements Yhaving a friction connection, control, means slid,-V

ablefonv 'one velementand linkconnected gto the Y other for var-yingI the, frictional :resist:

' ance of .said connection, said link connection hanne; 10st mctlolt and' means.. for vvarying lost motiolnof said link connection, .3. In combination, pivoted elevnientsjhav ingv afr i ctionj connection, and; control" means slidable on one element and link connected to the other for varying the frictional resistance of said connection, said link going past dead center at substantially the mid s point ofthe range of movement of the said elements.

4. In combination, an axle, a chassisnormally 'spaced from said axle for relative movement with respect thereto within a limited range, a `first and a second friction element, connections between the first element and the chassis, and between said second element and the axle for causing relative movement of said friction elements, and

automatic means for varying the friction tov make it relatively Weak during movement in movement of said friction elements, and automatic means for varying the frictiony tol malte it substantially negligible during y movement in either direction away from a either direction away from a predetermined intermediate position and a `material initial portion of the return movement-,and there-` after applying a maximum friction. t i `5. In combination, an axle, a chassisnorinally spaced from said axle for relative movementV with respect thereto within .a

limited range, a first anda second friction4 element, connectionsl betweenv the iirstelement and the chassis, and between the second element and the `axle `for causing relative predetermined intermediate position and during a material portion of the return` movement after each excursion, and thereafter developinor substantial friction to regg element and the axle, for causingv relative movement of said friction elements; automatic control means for varying the friction toreduce it to a substantially negligiblev amount upon passing through a. predetermined intermediate normal position in either direction and thereafter during all move' ment away from `normal regardless `of the extent of the excursion, and for the initial portion of the return movement regardless of the extent of the preceding excursion, and thereafter applying a maximum Vfriction, the undamped portion of the return movement being slightly greater in case of a short excursion than incase of a. long one; said automatic control means` permitting said initial undamped return movement by reason of back lash between its parts, and adjustment means for varying the amount of undamped returnmovement by varying the `back lash. 'i t Y 7 .y Incombination,` an axle; a chassis norinally spaced from said Aaxle for relative movement with respect thereto within a limited range; a first and a second-friction element; connections between the first ele-v predetermined intermediate normal positionv in either direction and thereafter during all movement away from normal regardless of the Vextent of the excursion, Vand for `the initial portion of the return movement regardless `of tlieextent of the preceding ex-V cursion, and thereafter applying a maximuni friction, the undamped portion of the return movement being not less, in case of a short excursion than in case of a long one. Y

8. In combination, an axle; a chassis normally spaced from said axle for. relative movement withv respectv thereto' within a limited range; a first and a second friction element;` connections between the' first element and the chassis, and between" the second element and the axle, for causing relative movement lof Asaid friction elements;` and automatic control means for varying the friction to reduce 4it to a substantially negligible amount upon passing through a predetermined intermediate normal position in either directionV and'thereafter during all movement away from normal regardless of the extent of the excursion, and for Athe Y initial portion of the return movement regardless of the extent of the preceding excursion, and thereafter applying a maximum friction, the undamped portion ofthe return movement being slightly greater in case of a short excursion than'in case of a long i Y one; said automaticcontrol-means permit-V ting said initial undamped `return movement by reasonV of back lash between its parts. In Witness whereof, I hereunto subscribe my name thisltY day of September, 1921.

1 `Dort/inn H. SWEET. 

